I. Overview:
By default, ASA does not respond to TTL exceeded packets, so Traceroute/tracert does not see the ASA device, and Traceroute/tracert cannot traverse the firewall because of firewall policy restrictions.
Two. Basic ideas:
Depending on how the Traceroute/tracert is handled, determine why it is not possible to traverse the firewall, thereby releasing the corresponding firewall policy:
A.windows
ASA supports two same-security-traffic types. Their application scenarios are1: different interfaces with the same security-level2: traffic between the same interfaces: cisco is called IPSEC hairpinnig, which is mainly defined in ipsec vpn.Description: ipsec vpn is not used for tunneling, or tunneling is not allowed. All traffic must be routed from the ASA.2. There are two scenarios: a: one client (vpn) to
It is actually using the file "global. asa "! Many new ASP programmers want to know what this is? In fact, global. asa is an event driver, which contains four event processing processes: Application_OnStart, Application_OnEnd, Session_OnStart, and Session_OnEnd.When a page of an application on a website is accessed by a user for the first time, global. asa
When you connect a VPN site with an external company, the IP address segment of the company that was originally used to connect with the other party is forced to become another address segment due to a change in the company's internal network, however, it is difficult for the other company to negotiate with each other. It is true that VPN cannot be used. In the previous versions of ASA, there is no way to do this. You can only add a vro inside the
I. Overview:
I listened to the ASA course of yeslab's instructor QIN Ke and talked about ASA's random initialization of serial numbers to disrupt TCP. So I set up an environment for testing and found that not only is the serial number initialized by TCP disrupted, the subsequent TCP packet serial numbers will also be disrupted.
---- Postscript: After listening to the subsequent tutorials, we know that the initialization serial number is disrupted beca
connection type to remote access.Tunnel-group vpnclient general-attributes//Configuring the authentication method for this channel groupAddress-pool vpnclient//define the address pool usedDefault-group-policy vpnclient//define default Group Policy-----Set up authentication methods and shared keys-------------Tunnel-group vpnclient ipsec-attributes//Configure authentication method for IPSecPre-shared-key *//Pre-shared key for IKE connectionTelnet Timeout 5//telnet timeout settingSSH 0.0.0.0 0.0.
1. Topology map
For audit purposes, the source address of the syslog must be the actual address of the device, and for other reasons, the Syslog server cannot be placed in the intranet.
2. Interface configuration:
R1:
R1 (config) #int f0/0
R1 (config-if) #ip add 10.1.1.18 255.255.255.0
R1 (config-if) #no sh
R2:
R2 (config) #int f0/0
R2 (config-if) #ip add 10.1.1.28 255.255.255.0
R2 (config-if) #no sh
R3:
R3 (config) #int f0/0
R3 (config-if) #ip add 20.1.1.38 255.255.255.0
R3 (c
Release date:Updated on:
Affected Systems:Cisco ASA Description:--------------------------------------------------------------------------------CVE (CAN) ID: CVE-2014-0653, CVE-2014-0655
The Cisco ASA 5500 Series Adaptive Security Device is a modular platform for providing security and VPN services. It provides firewall, IPS, anti-X, and VPN services.
A Security vulnerability exists in the implementation of
When the sybase asa database is shut DOWN abnormally, it is prone to exceptions, such as table or index errors. The trouble is that the database will go DOWN when you delete a table using drop table t_name. Below are two common restoration methods:
Sybase asa database restoration method
When the sybase asa database is shut DOWN abnormally, it is prone to except
I. Overview:
In actual work, it is estimated that two ISP lines, such as China Telecom and China Netcom, are often connected using ASA, and there is not enough budget to buy load balancing equipment, however, we want to achieve load sharing and automatic switching of links. We want to return traffic from China Telecom, from China Telecom to China Telecom, and from China Netcom to China Telecom. When one of the lines fails, all traffic never goes throu
Network Topology
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Set dynamic pat on the ASA firewall so that the Intranet can access the Internet through a public address
The command is as follows:
Ciscoasa (config) # NAT (inside) 11900001.0 255.255.255.0
Ciscoasa (config) # global (outside) 1 Interface
Set static nat on
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I. Overview:
It is estimated that the actual work will often encounter with Asa two ISP line, for example, Telecom and Netcom, and there is not enough budget to buy load balancing equipment, but want to achieve link load sharing and automatic switching, from telecommunications to traffic, from the telecommunications line back, from Netcom to the flow of traffic from the Netcom line back, When one of the lines fails, all traffic never goes off the fau
It is an important feature to determine whether a DBMS is powerful and whether external stored procedures are easy to create and use.
The ASA database has long been supporting the use of C, CLR (. NET), Java and other programming languages to create stored procedures.
The following is a simple example to create a Java-based ASA stored procedure, database (asa11.0 or later). This example is very simple. Ente
There are many ways to count online users in ASP, and I cannot figure out several ^ _ ^ methods. I would like to introduce three methods first. If there are any errors, please criticize and correct them. There are also good methods, please add it!
First, we will introduce a simple method, using application, session, and global. asa, because when the web pages created with ASP are stored in the base point directory of the WWW server and the WWW server
Tags: Cisco router Firewall
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Lab objectives:
1. Configure static routes to achieve network-wide interconnection.
2. R1 can telnet to R3, R4, and R3. The ACL rules are denied and the R4 cannot telnet to R1 and R3.
ASA
En
Conf t
Int E0/1
Nameif inside
Security-Level 100
IP add 10.1.1.10 255
There are many VPN products on the Cisco ASA Web VPN configuration market and their technologies are different. For example, in the traditional IPSec VPN, SSL allows the company to achieve more remote users to access the VPN in different locations, this service enables more network resources to be accessed and has low requirements on client devices, reducing the configuration and operation support costs. Many enterprise users adopt ssl vpn as the remo
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